JP2006289429A - Ceramic end tab for welding base materials with different widths - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent stress concentration from occurring at the portion where corner parts are formed at right angle to each of the bottom tip end part of a columnar base material and the toe part on the groove side face of a beam base material and where a defect such as an undercut is caused therein, in a weld toe part bead that is formed using the conventional end tab. <P>SOLUTION: The welding face 16 in use of the end tab is set in a position in which the welding face 16 in use is rotated (β°), from a plane parallel to a welding face 14 not in use to the inside of the end tab at a prescribed angle, with the intersecting line (β axis) between this welding face 16 in use and a level difference face 18 as a center axis, wherein the width of the level difference face 18 is essentially equalized from the lower part (initial layer) to the upper part (surface layer). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a ceramic end tab used when welding base materials having different widths mainly in the field of steel structures. More specifically, the present invention relates to a new ceramic end tab for solving a conventional ceramic end tab for different width base materials. The present invention relates to a ceramic end tab for welding a base material having a different width.

Conventionally, when welding base materials having different widths, an end tab having a shape as shown in FIG. 4 is used (hereinafter, in this specification, it is assumed that the end tab is used in a lateral orientation). To do). In other words, this end tab 100 is not used for welding that protrudes continuously through a bottom surface 102 that comes into contact with the column base material and a step 104 provided at an angle corresponding to the groove angle α ° of the beam processed base material. The welding use surface 108 is recessed relative to the surface 106.
FIG. 7 shows the state of attachment of this conventional end tab, and FIG. 8 shows the direction of stress transmission. When such an end tab is used, in the extra length bead C of the welding start / end portion shown in FIG. Concentration of stress occurs when corners perpendicular to both the pillar base bottom end B and the beam base groove side toe stop A are formed and defects such as undercuts occur in those parts. May occur. 5, 7, and 8, reference numeral 1 is a column base material, reference numeral 2 is a beam base material, reference numeral 3 is a molten metal, reference numeral 31 is a groove processing portion, and reference numeral 4 is a backing metal. Respectively. same as below.

In order to solve this problem, Japanese Patent No. 3095883 discloses an end tab 150 as shown in the attachment diagram of FIG. 9 in which the molten metal receiving groove, which is a welding use surface, is formed in a fan-shaped and arc-shaped inclined surface inclined inside the end tab. Has been proposed.
However, in such an end tab, as shown in FIG. 10, a fan-shaped extra-length bead (reference C) is formed outwardly at the start / end portion, and as a result, the beam base material side toe A and the column base are formed. Since each contact angle formed by the weld bead and the base material at the material tip B tends to be an acute angle, there is a problem that stress concentration increases at these portions.

Japanese Patent Application Laid-Open No. 2001-30094 proposes an end tab as shown in FIG. 13 in which the entire use surface for forming the molten metal receiving groove of the end tab is flattened and inclined.
However, the start / end bead using such an end tab shape has an excess length (C in FIG. 5) of the weld start / end end bead near the first layer portion (bottom root portion) as shown in the perspective view of FIG. It is long and formed short in the surface layer portion (plate thickness surface portion). For this reason, as shown in FIG. 12, the stress concentration in the beam base material side toe portion A increases in the first layer portion.
Japanese Patent No.3069583 JP 2001-30094

  Therefore, the present invention can solve the above-described problems of the conventional ceramic end tab for welding a different width base metal, and can be applied to a semi-automatic gas shielded arc welding and welding robot regardless of the welding position. It is an object to provide a ceramic end tab for welding a width base material.

The above-described problems are solved by any one of the ceramic end tabs having the following configurations (1) and (2) of the present invention.
(1) With respect to the bottom surface 12 that contacts the column base material, the welding non-use surface 14 that is provided on the side surface perpendicular to the bottom surface and that contacts the end surface of the beam base material 2 that has been grooved, and the welding non-use surface The welding use surface 16 which is relatively depressed, and the welding use surface and the welding non-use surface are continuously different widths through a step surface 18 provided at an angle corresponding to a groove angle α ° of the beam base material. In the ceramic end tab for base metal welding, the welding use surface has a predetermined angle from a surface parallel to the welding non-use surface with the intersection line (β axis) of the welding use surface and the step surface as a central axis. A ceramic end tab for welding a base material having a different width, wherein the ceramic end tab is provided at a position rotated inward (β °).
(2) The ceramic end tab for different width base metal welding according to the above (1), wherein the width of the stepped surface 18 is substantially the same from the lower part (initial layer part) to the upper part (surface layer part).

Hereinafter, a ceramic end tab for welding a different width base metal according to an embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows a ceramic end tab 10 for welding a different width base metal according to an embodiment of the present invention (hereinafter simply referred to as a ceramic end tab) provided on a bottom surface 12 in contact with a column base material and on a side surface perpendicular to the bottom surface 12. A welding unused surface 14 that comes into contact with the end face of the beam base material subjected to the groove processing, and a welding used surface 16 that is recessed relative to the welding unused surface 14, the welding used surface 16 and the welding unused surface. 14 continues through a stepped surface 18 provided at an angle corresponding to the groove angle α ° of the beam base material. In the ceramic end tab 10 shown in FIG. 1 of the present invention, the welding use surface 16 has the β-axis that is the intersection line of the welding use surface 16 and the stepped surface 18 as a central axis, and the welding non-use surface 14. Is provided at a position rotated from the plane parallel to the inner surface of the end tab at a predetermined angle.
It is preferable that the width of the stepped surface 18 is substantially the same from the lower part (initial layer part) to the upper part (surface layer part).

In FIG. 1, the symbol h is the height of the ceramic end tab 10. The symbol G is the width of the root gap of the ceramic end tab 10, and 7 mm is a reference. The symbol α is a groove angle, and includes 25 °, 30 °, 35 °, and 45 °. The symbol β ° is the rotation angle of the welding use surface 16, and when α ° is 35 ° and G is 7 mm, a range of 15 ° to 22 ° is preferable.
The symbol γ ° represents a spread angle of the welding use surface 16 to the bottom surface 12 with respect to a plane parallel to the non-welding surface 14, and is determined by the above α ° and β °. If it is, it will be the range of 12.4 degrees-18.3 degrees.
The symbol D is the depth of the step in the step surface 18 and is preferably 2 to 4 mm in relation to the length of the extra bead on the beam base material side (portion connecting items 6 to 5 in FIG. 6). If it exceeds, defects such as undercuts are likely to occur in the beam base material side. Reference sign D ° is an angle of the stepped surface 18 with respect to the non-welded surface 14, and in order to prevent the occurrence of defects such as undercut, a gentle angle (120) is formed so that a corner portion is not formed in the above-described portion (A). ~ 135 °) is preferable.
When the rotation angle β ° is less than the above value, the spread angle γ ° to the column base material (bottom surface) becomes small, and the stress concentration at the column base material tip (B) increases.

On the other hand, if the above value is exceeded, the spread angle γ ° will increase, but the angle between the surface of the column base material 1 and the welding end surface 16 of the ceramic end tab will become narrow, making welding difficult and the column base material. It becomes difficult to give sufficient melt | dissolution with respect to (the part of items 3-5 shown in FIG. 6 of a bottom face).
Moreover, in this ceramic end tab 10, shapes, such as a welding use surface, are formed in the opposite side surface in rotational symmetry.
In the ceramic end tab 10 described above, if the height (symbol h) of the tab material is equal to or larger than a size obtained by adding a predetermined surplus portion to the plate thickness of the beam base material, the spread angle γ to the bottom surface is whatever the base material thickness. 6 is obtained, and the size of the portion of item 6 shown in FIG. Therefore, in the past, it was necessary to prepare an end tab with a height (h) corresponding to the plate thickness of the beam base material to be welded. When using this end tab, prepare an end tab for each plate thickness. It is not necessary to reduce the number of end tabs, and cost effectiveness and construction management can be simplified.

（２）試験体形状
本実験は柱母材に四面スキンプレートボックス柱を想定して図１４に示すような実験用テストピースを製作した。
柱母材に相当する25t×150w×300LのSN490B鋼材を平置きして下板１とし、梁母材に相当するものとして22t×150w×250Lの250Lの側面のうち１面を開先角度35°に機械加工を施した同鋼種プレート２を前記下板１の上面に垂直に設置して、Ｔ継ぎ手の横向き姿勢用とした。したがって、溶接長は２５０mmである。なお、上記試験体のルートギャップ７mmの部分には、9t×25w×300Lのプレートを用いた裏当て金４を取り付けた。
（３）溶接実験方法
（１）溶接方法： 本実験はガスシールドアーク溶接方法を採用した。
（２）溶接条件： ・電流（Ａ） ２２０〜３３０
・電圧（Ｖ） ２６〜３５
・速度（ｃｍ／ｍｉｎ） １５〜９０
（４）サンプル（エンドタブ）の取付け状況
（１）実施例１から６におけるエンドタブ（図１）の試験体への取付け状況は図２に示す通りである。
比較例のエンドタブの試験体への取付け状況は、図４に示す比較例１を図７に、図１３に示す比較例２を図１１に示す通りである。
（２）取付け状況図２に示す実施例１から６と図７に示す比較例１では、段差の深さＤが初層部（底面ルート部）から梁母材２の表層部（板厚表面部）まで一定である。
しかしながら、比較例２のｈ３２mmのエンドタブを梁母材２の板厚２２mmの試験体に取付けた場合、表１に示す通り、エンドタブ表層部での段差ｄ２は3ｍｍであるが、梁母材（図１４の２）の板厚２２mmに相当するビード表層部分(図１１のd3)では段差が４．５mmに増加する。この段差増加量は梁母材板厚が薄くなる程大きく、応力集中傾向を増大させることとなる。 (1) Shape of sample (end tab) Eight types of ceramic end tab samples listed in Table 1 were prepared in preparation for a welding experiment, and designated as Examples 1 to 6. As a comparative example, the conventional shape shown in FIG. 4 is referred to as comparative example 1, and as shown in FIG. 13, the end tab inner surface 12 is arranged so that the end bead spreads relatively from the groove top to the bottom. The shape cut at 4 ° was designated as Comparative Example 2.
The names and symbols of the parts shown in Table 1 are as illustrated in FIGS. 1, 2, 7, 11, and 13.

(2) Shape of test body In this experiment, a test piece as shown in FIG. 14 was manufactured assuming a four-side skin plate box column as a column base material.
The SN490B steel material of 25t x 150w x 300L corresponding to the column base material is laid flat to make the lower plate 1, and one side of the 250L side of 22t x 150w x 250L as the beam base material has a groove angle of 35 The same steel type plate 2 machined at 0 ° was installed vertically on the upper surface of the lower plate 1 for a lateral orientation of the T joint. Therefore, the weld length is 250 mm. A backing metal 4 using a 9 t × 25 w × 300 L plate was attached to a portion of the above-mentioned test specimen having a root gap of 7 mm.
(3) Welding experiment method (1) Welding method: This experiment adopted a gas shielded arc welding method.
(2) Welding conditions: Current (A) 220-330
・ Voltage (V) 26-35
・ Speed (cm / min) 15-90
(4) Sample (end tab) attachment state (1) The state of attachment of the end tab (FIG. 1) to the test body in Examples 1 to 6 is as shown in FIG.
FIG. 7 shows the comparative example 1 shown in FIG. 4, and FIG. 11 shows the comparative example 2 shown in FIG.
(2) Mounting condition In Examples 1 to 6 shown in FIG. 2 and Comparative Example 1 shown in FIG. 7, the depth D of the step is from the first layer part (bottom root part) to the surface layer part (plate thickness surface) of the beam base material 2 Part).
However, when the h32 mm end tab of Comparative Example 2 is attached to the beam base material 2 having a plate thickness of 22 mm, as shown in Table 1, the step d2 at the end tab surface layer is 3 mm. In step 14-2), the step height increases to 4.5 mm in the bead surface layer portion (d3 in FIG. 11) corresponding to a plate thickness of 22 mm. The amount of increase in the level difference increases as the beam base material plate thickness decreases, increasing the stress concentration tendency.

（２）実験結果の説明
（１）本発明エンドタブに関わる実施例１から６については、溶接始終端部ビード部分にて、底面（図６に示す項目３と４を結ぶ線）への溶け込み状況は良好であり、梁母材側面（項目５と６を結ぶ線）で欠陥の発生はなく、優れたビード外観が形成された。また、図6に示す項目５と６の線上および項目３と４の線上の各隅角部は直角でない円弧状の滑らかな形状となり、しかも、項目５から３、および項目６から４へかけての広がりも同等の角度が確保でき、図３に示す通りの結果が得られた。
なお、実験の検査項目の総合評価において◎と判定した実施例２と実施例５の差は殆んどなかったが、梁母材開先側の最終層上部（項目６の部分）におけるビード馴染み（融合）の点で、実施例２の方が、一層良い結果であった。
（２）比較例１については、評価項目１で端部が見え難いという作業性の問題があり、図６に示す項目３から４の線上、および項目６の部分に溶け込み不良が発生した。
（３）比較例２については、図6に示す項目３〜５における溶け込み不良が発生した。 Experimental results (1) The experimental results are evaluated and shown in Table 2. Evaluation items 1 and 2 evaluated welding workability, and evaluation items 3 to 6 evaluated items 3 to 6 shown in FIG. Evaluation item 7 was a comprehensive evaluation. Evaluation was performed by visual inspection and displayed in five stages of ◎ ○ △ ▲ ×.

(2) Explanation of Experimental Results (1) For Examples 1 to 6 related to the end tab of the present invention, the penetration state to the bottom surface (line connecting items 3 and 4 shown in FIG. 6) at the weld start / end bead portion Was good, there was no defect on the side of the beam base material (line connecting items 5 and 6), and an excellent bead appearance was formed. Further, each corner portion on the line of items 5 and 6 and on the line of items 3 and 4 shown in FIG. 6 is a non-right-angled arc-shaped smooth shape, and from item 5 to 3 and from item 6 to 4 The same angle can be ensured for the spread of, and the results shown in FIG. 3 were obtained.
In addition, although there was almost no difference between Example 2 and Example 5 determined as ◎ in the overall evaluation of the test items in the experiment, bead familiarity in the upper part of the final layer (item 6 part) on the beam base material groove side. In terms of (fusion), Example 2 gave better results.
(2) In Comparative Example 1, there was a problem of workability that it was difficult to see the end portion in the evaluation item 1, and a poor penetration occurred on the line of items 3 to 4 and the portion of item 6 shown in FIG.
(3) About the comparative example 2, the penetration defect in the items 3-5 shown in FIG.

The detailed explanatory view of the end tab of the present invention. The end tab attachment state figure of the present invention. The toe part bead shape figure using this invention product. Conventional ceramic tab for different width base material (Comparative Example 1). Explanatory drawing of a corner part (front view after welding). The appearance inspection item location figure of an experimental result (front view which looked at the weld toe part bead). The attachment figure of the conventional shape (comparative example 1). The toe part bead shape figure at the time of using the conventional shape (comparative example 1). The installation situation figure of a concave arcuate end tab. The toe part bead shape figure at the time of using a concave arc-shaped end tab. The attachment state figure of the end tab (comparative example 2) inclined inward relatively. The toe part bead shape figure at the time of using the end tab (comparative example 2) inclined inward relatively. End tab (Comparative Example 2) shape inclined relatively inward. The shape of the specimen and the size of each part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Ceramic end tab of this invention 12 Ceramic end tab bottom face of this invention 14 Ceramic end tab welding non-use surface of this invention 16 Ceramic end tab welding use surface of this invention 18 Ceramic end tab step surface of this invention D Step depth (d1 is the first layer) Part, d2 is the surface layer part)
D ° Angle of step surface to non-use surface (14) α ° Groove angle β axis Intersection line (segment) of use surface (16) and step surface (18)
β ° Surface rotation angle γ ° Spreading angle to low surface S Spreading width to low surface (S1 first layer part, S2 is surface layer part)
G Route gap h End tab height 1 Column base material 2 Beam base material 3 Welded metal 31 Groove processing part 4 Backing metal 100 Conventional end tab (Comparative Example 1)
102 Conventional End Tab (Comparative Example 1) Bottom 104 Conventional End Tab (Comparative Example 1) Stepped Surface 106 Conventional End Tab (Comparative Example 1) Non-use Surface 108 Conventional End Tab (Comparative Example 1) Use Surface 150 Concave Type Arc-shaped end tab shape 200 End tab relatively inclined inward (Comparative Example 2) shape 202 Bottom surface 204 of end tab relatively inclined inward (Comparative Example 2) End tab relatively inclined inward (Comparison Step surface 206 of Example 2) Non-use surface 208 of end tab relatively inclined inward (Comparative Example 2) Use surface of end tab relatively inclined inward (Comparative Example 2) A Beam base material side toe Corner B B Corner corner of the bottom of the column base material C End bead

Claims (2)

  A bottom surface that contacts the column base material, a side surface perpendicular to the bottom surface, a non-welded surface that contacts the end surface of the beam base material that has been grooved, and a weld that is recessed relative to the non-welded surface In the ceramic end tab for welding a different width base material, wherein the welding use surface and the welding non-use surface are provided through a step surface provided at an angle corresponding to a groove angle of the beam base material. The use surface is provided at a position rotated to the inside of the end tab at a predetermined angle from a surface parallel to the welding non-use surface with the intersection line of the welding use surface and the step surface as a central axis. Characteristic ceramic end tab for welding different width base metal. 2. The ceramic end tab for welding a different width base metal according to claim 1, wherein the width of the stepped surface is substantially the same from the lower part to the upper part.

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